I use this code for view nib to stackview
for index in 0..<4 {
let view = CategoryClass.createMyClassView()
view.myLabel.text = "Hello World!"
self.stackView.addArrangedSubview(view)
}
And I get below image :
But I want to add subview by category.xib height ( 40px per view ) not fill.
And set in center of parent
Like below :
Screenshot:
Please add Four label in Xib and after put in stackView and give spacing like 5, 10, 20 whatever you like
Please check screenshot and let me know if u have any problem related stackview i will help you
you need to delete the top and bottom constraints of the stackView. Or you can delete any one and make the other constraint in greater than or equal to form
This will solve your problem
Related
I have two views one inside another, it looks like picture below:
when I press on orange arrow I would like to show/hide view above grey line and grey line too. I did it by such way:
#objc func showHide(tapGestureRecognizer: UITapGestureRecognizer)
{
let tappedImage = tapGestureRecognizer.view as! UIImageView
UIView.animate(withDuration: 0.2, animations: { () -> Void in
self.jobDataView.isHidden = !self.jobDataView.isHidden
self.view.layoutIfNeeded()
})
tappedImage.image = self.jobDataView.isHidden ? UIImage(systemName: "arrow.down"):UIImage(systemName: "arrow.up")
}
and my view above gray line can be hidden and shown. But root view doesn't change its' height and it has similar sizes before and after btn click. I tried to add constraint of height, but I it didn't solve my problem. Maybe someone knows how to solve my problem?
You need to use UIStackView either through Storyboard or from code. when you hide subview inside stackview it will automatically change stackview height. what you need to do is to make stackView distribution = fill and use vertical stack...
Hide view on button tap and when you need to show it .. add it in stack at. 0th index ..
(Xcode 11, Swift)
Being a newbie to iOS and Autolayout, I'm struggling with implementing a fairly simple (IMHO) view which displays a [vertical] list of items. The only problem is that items are decided dynamically and each of them could be either text or image (where either of those could be fairly large so scrolling would be required). WebView is not an option, so it has to be implemented natively.
This is how I understand the process:
Make in IB a UIScrollView and size it to the size of the outer frame.
Make a container view as a subview of UIScrollView (again, in IB) and size it the same.
Set constraint on equal width of both
At runtime, populate container view with UILabels/UIImageViews and also set constraints programmatically to ensure proper layout.
"Tell" scrollview about the subview height in order to make it manage the scrolling thereof.
Is this the right approach? It doesn't seem to work for me (for a toy example of dynamically adding a very tall image to a container view - I cannot get the scrolling to work). What would be the proper way to do the last step in the process above - just force the contentSize of the scrollview to the size of the populated container view (it doesn't seem to work for me). Any help would be appreciated.
When adding multiple elements to a scroll view at run-time, you may find it much easier to use a UIStackView... when setup properly, it will automatically grow in height with each added object.
As a simple example...
1) Start by adding a UIScrollView (I gave it a blue background to make it easier to see). Constrain it to Zero on all 4 sides:
Note that we see the "red circle" indicating missing / conflicting constraints. Ignore that for now.
2) Add a UIView as a "content view" to the scroll view (I gave it a systemYellow background to make it easier to see). Constrain it to Zero on all 4 sides to the Content Layout Guide -- this will (eventually) define the scroll view's content size. Also constrain it equal width and equal height to the Frame Layout Guide:
Important Step: Select the Height constraint, and in the Size Inspector pane select the Placeholder - Remove at build time checkbox. This will satisfy auto-layout in IB during design time, but will allow the height of that view to shrink / grow as necessary.
3) Add a Vertical UIStackView to the "content view". Constrain it to Zero on all 4 sides. Configure its properties to Fill / Fill / 8 (as shown below):
4) Add an #IBOutlet connection to the stack view in your view controller class. Now, at run-time, as you add UI elements to the stack view, all of your "scrollability" will be handled by auto-layout.
Here is an example class:
class DynaScrollViewController: UIViewController {
#IBOutlet var theStackView: UIStackView!
override func viewDidLoad() {
super.viewDidLoad()
// local var so we can reuse it
var theLabel = UILabel()
var theImageView = UIImageView()
// create a new label
theLabel = UILabel()
// this gets set to false when the label is added to a stack view,
// but good to get in the habit of setting it
theLabel.translatesAutoresizingMaskIntoConstraints = false
// multi-line
theLabel.numberOfLines = 0
// cyan background to make it easy to see
theLabel.backgroundColor = .cyan
// add 9 lines of text to the label
theLabel.text = (1...9).map({ "Line \($0)" }).joined(separator: "\n")
// add it to the stack view
theStackView.addArrangedSubview(theLabel)
// add another label
theLabel = UILabel()
// multi-line
theLabel.numberOfLines = 0
// yellow background to make it easy to see
theLabel.backgroundColor = .yellow
// add 5 lines of text to the label
theLabel.text = (1...5).map({ "Line \($0)" }).joined(separator: "\n")
// add it to the stack view
theStackView.addArrangedSubview(theLabel)
// create a new UIImageView
theImageView = UIImageView()
// this gets set to false when the label is added to a stack view,
// but good to get in the habit of setting it
theImageView.translatesAutoresizingMaskIntoConstraints = false
// load an image for it - I have one named background
if let img = UIImage(named: "background") {
theImageView.image = img
}
// let's give the image view a 4:3 width:height ratio
theImageView.widthAnchor.constraint(equalTo: theImageView.heightAnchor, multiplier: 4.0/3.0).isActive = true
// add it to the stack view
theStackView.addArrangedSubview(theImageView)
// add another label
theLabel = UILabel()
// multi-line
theLabel.numberOfLines = 0
// yellow background to make it easy to see
theLabel.backgroundColor = .green
// add 2 lines of text to the label
theLabel.text = (1...2).map({ "Line \($0)" }).joined(separator: "\n")
// add it to the stack view
theStackView.addArrangedSubview(theLabel)
// add another UIImageView
theImageView = UIImageView()
// this gets set to false when the label is added to a stack view,
// but good to get in the habit of setting it
theImageView.translatesAutoresizingMaskIntoConstraints = false
// load a different image for it - I have one named AquariumBG
if let img = UIImage(named: "AquariumBG") {
theImageView.image = img
}
// let's give this image view a 1:1 width:height ratio
theImageView.heightAnchor.constraint(equalTo: theImageView.widthAnchor, multiplier: 1.0).isActive = true
// add it to the stack view
theStackView.addArrangedSubview(theImageView)
}
}
If the steps have been followed, you should get this output:
and, after scrolling to the bottom:
Alignment constraints (leading/trailing/top/bottom)
The alignment constraint between Scroll View and Content View defines the scrollable range of the content. For example,
If scrollView.bottom = contentView.bottom, it means Scroll View is
scrollable to the bottom of Content View.
If scrollView.bottom = contentView.bottom + 100, the scrollable
bottom end of Scroll View will exceed the end of Content View by 100
points.
If scrollView.bottom = contentView.bottom — 100, the bottom of
Content View will not be reached even the scrollView is scrolled to
the bottom end.
That is, the (bottom) anchor on Scroll View indicates the (bottom) edge of the outer frame, i.e., the visible part of Content View; the (bottom) anchor on Content View refers to the edge of the actual content, which will be hidden if not scrolled to.
Unlike normal use cases, alignment constraints between Scroll View and Content View have nothing to do with the actual size of Content View. They affect only “scrollable range of content view” but NOT “actual content size”. The actual size of Content View must be additionally defined.
Size constraints (width/height)
To actually size Content View, we may set the size of Content View to a specific length, like width/height of 500. If the width/height exceeds the width/height of Scroll View, there will be a scrollbar for users to scroll.
However, a more common case will be, we want Content View to have the same width (or height) as Scroll View. In this case, we will have
contentView.width = scrollView.width
The width of Content View refers to the actual full width of content. On the other hand, the width of Scroll View refers to the outer container frame width of Scroll View. Of course, it doesn’t have to be the same width, but can be other forms like a * scrollView.width + b.
And if we have Content View higher (or wider) than Scroll View, a scrollbar appears.
Content View can not only be a single view, but also multiple views, as long as they are appropriately constrained using alignment and size constraints to Scroll View.
For details, you may follow this article: Link.
I would like to create a vertical stackview with 3 elements in it.
I want a bit more space only between the 2nd and the last element. So I thought about adding to the last element :
mylastelement.layoutMargins = UIEdgeInsets(top:30, left:0,bottom:0, right:0)
But the layoutmargins are not applied in my stackview. Is there any easy way to achieve that (Id like to avoid to modify the last element inner height).
EDIT : I just tried to increase 2nd element height (+50) within its frame by doing :
my2ndElementLabel.sizeToFit()
my2ndElementLabel.frame = CGRect(x:my2ndElementLabel.frame.origin.x,y:lmy2ndElementLabel.frame.origin.y,
width:my2ndElementLabel.frame.width, height:my2ndElementLabel.frame.height + 50)
but it has no effect.
EDIT2 : I tried to add a random view to my UIStackView, but the the view is just ignored ! May have missed something in understanding how UIKit work ?... :
let v = UIView(frame:CGRect(x:0,y:0,width:100,height:400))
v.backgroundColor = .red
myStackView.addArrangedSubview(v)
//...
Here is an extension I made that helps to achieve fast such margins :
extension UIStackView {
func addArrangedSubview(_ v:UIView, withMargin m:UIEdgeInsets )
{
let containerForMargin = UIView()
containerForMargin.addSubview(v)
v.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
v.topAnchor.constraint(equalTo: containerForMargin.topAnchor, constant:m.top ),
v.bottomAnchor.constraint(equalTo: containerForMargin.bottomAnchor, constant: m.bottom ),
v.leftAnchor.constraint(equalTo: containerForMargin.leftAnchor, constant: m.left),
v.rightAnchor.constraint(equalTo: containerForMargin.rightAnchor, constant: m.right)
])
addArrangedSubview(containerForMargin)
}
}
What you could do is set a custom spacing between the second and third element.
myStackView.setCustomSpacing(30.0, after: my2ndElementLabel)
In the same general vein, you can constrain the top (or bottom) anchor of your view relative to the corresponding edge of any view in which it's embedded. What's ugly being somewhat a matter of taste, I find autolayout constraints easy to use and easy to reason about.
A simple example from Mac OS rather than iOS:
let button = ControlFactory.labeledButton("Filter")
addSubview(button)
button.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -20).isActive = true
button.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
This particular code lives in the view initializer, and positions a button in the middle of a view, 20 points up from the bottom.
I found myself : It looks like UIStackView doesn't work at all with old sizing system (with .frame). It seems you have to constraint height and width, and StackView will constraint left/top/right/bottom position for you when you add the arrangedSubview.
My second view was a label : I wanted a margin of 40, under the text. So i first computed the label height into its .frame property, and constraint the height at frame.height + 40(= my margin)
labelDesc.sizeToFit()
labelDesc.heightAnchor.constraint(equalToConstant:40).isActive = true
I find my own solution utterly ugly though. I'm sure UIKit provide a better way to achieve such a simple goal, without having to make these kind of DIY solutions. So please if you're used to work with UIKit, tell me if there is any better solution.
Consider adding a "margin" by inserting a correctly-sized UIView within the Stack View as needed.
If you need a 40px margin between 2 specific elements... add a UIView with a height constraint of 40px. Assign a clearColor background to make it invisible.
You can add IBOutlets to this view and hide it as you would any other item in the Stack View.
Confused on this one...
I have a stackview in a tableview cell.
The stackview (Center, Equal Spacing) has two sub stackviews,
Left stackview (Fill, Fill) has a UIButton (infoButton) and UILabel (Description)
Right stackview (Fill, Fill) has just UILabel
When I set infoButton.isHidden = true, Description is nowhere to be seen on iOS 10.2. On iOS 11.1 it works as expected.
Thanks for taking a look!
Image: iOS 11.1 on left, iOS 10.2 on right.
Additional Info:
if (input.Help == ""){
aCell.infoButton.isHidden = true
} else {
aCell.infoButton.isHidden = false
aCell.infoButton.tag = i
aCell.infoButton.isUserInteractionEnabled = true
aCell.infoButton.addGestureRecognizer(tap)
}
Solved: I changed the Stack View (that contains the button and label together) to Alignment 'Center' instead of 'Fill'. The Stackview height had been changing to 0 as observed in the View Debugger (thank you Matt for pointing me to the debugger!)
Changed the Stack View (that contains the button and label together) to Alignment 'Center' instead of 'Fill'.
The Stackview height had been changing to 0 as observed in the View Debugger (thank you Matt for pointing me to the debugger!) when one subview of the stack was set to hidden.
I had a similar issue placing a Label and Text Field inside stack view containing another Label as the title. Wanted to hide/show Text Field and Label for editing purposes (eg: First Name Label and First Name Text Field. If editing would show only the Text Field, otherwise, show only the Label).
Title: First Name (always visible)
Label: John (hidden when editing)
Text Field: John (hidden when not editing)
My problem: When showing back the Label it was disappearing along with the title Label.
My solution: Embedding into a stack view the Name Label and Text Field
Hope this helps :)
I Have a Horizontal Collection View with Cells containing a label that has auto layout that expands on the size of the cell view.
Im using Xcode 8 and Swift 3.
How can I make so that my cell size is dynamic based on the text? I mean, I want it to expand, so that Otro Text... Reads complete instead of how its shown right now with the dots.
As You can see on the screenshot, now my large text gets trimmed (The Collection view, is on the area that has the Texts: Todo, Otro Text... Test1).
Hope someone can help or orient me on finding a solution.
You need to make sure that the you add leading and trailing constraint to the label and do not add any width constraint.
Next step is to give an estimatedSize in you collectionViewLayout.
Example
if let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
flowLayout.estimatedItemSize = CGSize(
width: 100, height: collectionView.bounds.size.height)
}
You need to set the estimatedItemSize in your UICollectionViewLayout to be able to enable self-sizing cells. It is not possible from Storyboards, only available through code.